Improvement in machines for grinding hand-saws



vEnwrn s. Parnu, or nooEE'srEE, NEW Youn.

Letters PatentNo. 111,147, dated January 24, 1871.

IMPRovl-:MENT IN'MAcHiNx-:s FoR GRINDING HAND-saws.

The Schedule referred to in these Letters Patent: and pari: o the` same.

" To all whom tt may concern Be it known that I, EDWIN S. PrPEn, of Roches ter, in thel county of Monroe and State ofNew York, have invented a new Improvement in Machines for Grinding Hand-Saws; and I do hereby declare the following, when taken in connection with the accompanying ldrawing and the lettersv of reference marked thereon, vto be a full, clear, and exact description of the same, and which said drawing 4constitutes part of this specification, and represents in Figure 1 a front View;

- Figure 2, a side view; and in Fgures 3, 4, 5, and 6, detached views @to illustrate the construction and operation.

This invention ,relates to an improvement in machines for grinding ysaw-plates, the object being the construction-of a machine which shallbe vselfadj nsting, so as to automatically bringthe saw-plate to the required thickness from one end to the other.

Such plates are formed of an even thickness upon the toothed edge, diminishing in thickness `toward the back slightly at the heel, and gradually thinning 'on the back from the heel to the-point.

My invention consistsn ]irst, in a compound adjustment of the feedingrolls.

Second, in an automatic arrangement for adjusting the inclination of thea'xles of the stonesv so as to give the vincreasing thickness to the back of the saw frornthepoint to the heel.

' A is the frame which supports the operative. mechanism;

B is the upper stone; and Y C, the lower stone, hung upon their respective axles .'Bl andC, and so as to revolve freeiy on bearings B2 and G2, 'the said bearings being constructed so as to rock and opcra-teat different inclinations, and the two stones caused to revolve by the application of power through the pulleys lD and D.

The face of the stones is made conical, corresponding to the inclination at which theyare set, so that the two faces may lie parallel to each other. This gives to the stones au increasing diameter from one y end to the otherand, revolving upon the work, imparts as it were, a sliding grind, but yet the work ground in a straight line from end to end, and without wavering, as with stones which are hung with ,parallel axles.

lhe feeding device consists of tworolls, the `one driven by the shaft F and the other by the shaft G, shownenlarged in figs. 3 and 4.

The shaft F, to which one rollH` (see g. 4) is fixed, is hung in a bar, I, (see gs. 3, 4, and 5,) the said bar being pivoted transversely at a to a second bar, L, and the barL pivoted longitudinally at l, (seeV g. 3,) so that, by means vof the bar L, the roll maybe raised vertically, and by the pivot an transverse inclination may be given to the roll to correspond to theirregularities on the 'surfaceof the saw-plate, bythis construction giving acompound or' universal movement to the feeding-rolls.`

The feeding-rolls are caused to revolve by the application of power thereto through the pulleys M and N.- One of these feeding devices is arranged on each side of the stones, as seen in iig. 2,-so that a sa'w fed in at one side is carried through between the stones into the feeding device at the other side, andvby the last drawn through when the rst shall have ceased to actthat is, when the plate has passed out ofthe irst device.

Upon the bar I, springs I are arranged sofas to bear the upper roll upon the lower, and yet allow the Yroll to automatically adjust to the vsurface of the saw-plate. The feed-rolls H and H@ are threaded, so that, by` the revolving of the rolls to draw in the saw-plate,

`the screw-"-thread on the rolls will work off from the plate' the mud which will accumulate on the surface -of the plate during theprocess of grinding.

The feeding devices are supported upon bars, j, and these bars are fixed to a slide, f', upon opposite sides of the frame, and these slides are raised up or down, as may be requirerhto set the feeding device relatively to the stones, and this I doby screws, U, operated by a hand-wheel, W', connected vby suitable gearing with the said screws."

In grinding saws, it is necessary that the point be thin at the back, gradually 4increasing toward the heel,

vwhile the edge remains of aneveu thickness from heel to point. To do this it is necessary to change the position of the stones or inclination of their axles, and

F, revolving, operates the lever P to gradually change the inclination of the axle. v v

The lower end of the shaft It is supported in bear-V ing It', to permit the adjustment of the nut fr in the lever P to give a greater orlesser throw to the toggle.

The toggle raisesor llowers .a carriage, G2, uponwhich the bearing C1 ofthe lower stone rests, and, as this lever is operated by the feed-rolls, the-adjustment of the stone is made to correspond to the movement of the saw-plate `between the stones. Therefore,

ground, while the other edge will be adjusted to retainthe same thickness, and thus the desired form of grinding will be attained.

The bearings for the lower axle are adjusted to bring the stones nearer together or carry them farther apart, by a screw, U, under each carriage, .which are operated by a hand-wheel, W, working by suitable gears in a shaft, X, for each screw, and witha worm, u, on each of the said shafts working in a pinion, an, on the said screws.,

Iarrange, if desired, upon one or both stones, suitable bonnets or shoulders, denotedv in the drawin as only upon the lower stone. i

I claim as my invention;- 1. The feed-rolls H H', one of" which is arranged in a universal bearing so as to be self-adjusted to Witnesses: y

CHRIS. GAFEIN, Y RICHARD H. SCHOOLEY. 

